We're going to turn to the latest details on the brazen big-money heist at new york's jfk airport. 1.2 million in cash taken from a secured container on a swissair flight. The fbi is going to administer lie-detector tests to jfk employees today. Reporter: Investigators think this was an inside job. A jfk employee grabbing cash that was supposed to be heading to the new york federal reserve bank. This is the latest brazen crime involving new york's main airport, jfk. The movie "good fellas" fortrays at the time what was the biggest heist of cash at the time. Fast forward 34 years, and a pair of criminals hit the same cargo terminal, making off with $1.5 million of ipads. Then, there was the united airlines employ who cops say admitted to stealing fancy perfumes and high-end electronics out of the mail at jfk. Now comes sisz ware flight 17. An insider poked a hole, possibly with a forklift, and grabbed 12 bundles of cash, each worth $100,000, for a total of $1.2 million. Former nypd investigator nick casale, says the problem is not the loot. It's a breach that somebody could have put a bomb into the aircraft. Reporter: In defense of jfk, investigators think the security breach probably took place overseas before the money was loaded on to the plane. But remember, jfk is the same place where a jet skier was able to swim ashore and easily penetrate the airport's $100 million security system. As for the crooks, nick casale points out, they almost always get caught because of greed and stupidity. Then, there's always the ultimate. Someone gets pinched and talks. That's how most major crimes are solved. Reporter: In fact, the criminals involved in all the major jfk heists we listed this morning were all eventually busted. And the fbi indicates today's lie-detector test could be key in finding the culprit. We asked for comment on the overall security. But they had no comment.

This transcript has been automatically generated and may not be 100% accurate.

$1.2 Million Plane Heist

FBI is left with lots of questions about how $1.2 million vanished off a Swiss Air Flight.

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